用随机疲劳理论计算轧机零件寿命

The life calculation of rolling mill parts with random fatigue theory

本文根据中板轧机机架的故障状况,实测了外载荷,编制了载荷谱,用有限元法将压力谱换算为应力谱,根据机架材料的疲劳性能曲线及应力谱,估算了轧机机架的疲劳寿命。本文提出了谱的加权平均、复杂应力的当量换算及用随机疲劳理论估算寿命的方法。

Based on the failure status of some plate rolling mill's housing. the external load was measured in site.the load spectitonvhas been worked out, the rolling pressure spectrum then converted into stress spectrum by means of finite element analysis, and the fatigue life of mill housing estimated according to the fatigue property curve of the materials and the stress spectrum. The paper has put forward the weighted average of the spectrum, equivalent conversion of complex stress and the method of life estimation with random fatigue theory.